Corkscrew



FIG. 1 is a front, left side perspective view of a corkscrew showing the design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in FIGS. 1, 2, 4, and 7 depict portions of the corkscrew which do not form part of the claimed design. 

I claim the ornamental design for a corkscrew, as shown. 